Pennsylvania Code
Title 34 - LABOR AND INDUSTRY
Part I - Department of Labor and Industry
Chapter 43 - TUNNEL CONSTRUCTION AND COMPRESSED AIR WORK
Subchapter A - TUNNEL CONSTRUCTION AND WORK IN COMPRESSED AIR
TUNNEL CONSTRUCTION
Section 43.25 - Loading of explosives
Current through Register Vol. 54, No. 38, September 21, 2024
(a) Detonators shall be inserted in the explosives only as required for each round of blasting. Detonators shall not be inserted in the explosives without first making a hole in the cartridge with a sharpened stick. No holes shall be loaded except those to be fired at the next round of blasting. All explosives remaining after loading a round shall be removed from the heading before any wires are connected.
(b) If electric devices, such as electric blasting caps, are used, the legs of these devices shall be short-circuited by twisting the naked ends together before taking them into the tunnel. They shall remain twisted until ready to be connected to the firing line.
(c) All lights used when loading shall be an enclosed type. If electric flash lamps are used, they shall be so constructed that it is not possible to obtain a difference of potential between any two points on the outside of the lamp casing.
(d) No naked light shall be used in the vicinity of open chests or magazines containing explosives, or near where a charge is being primed.
(e) Fuses may be kept with detonators. All crimping of caps on fuse shall be done with a crimper at least 25 feet away from explosives.
(f) All drill holes shall be of sufficient bore to permit the free insertion of a cartridge of explosive to the bottom of the hole without the necessity of undue ramming or removing the dynamite from its original wrapper.
